I'm no c programmer, and I'm a ctypes newbie. I'll frame my problem as simply as I can. Sorry if it's too much or not enough info. I don't expect an explicit answer (but maybe), just help figuring out how to debug.
WinXP, python 2.4.2 I'm using ctypes to access functions in a commercial dll. A certain function takes five arguments, foo(a, b, c, d, e). The last argument, e, is an integer that serves as a bit coded options flag. Zero means no option, 1+2+4 means the first three options combined, etc. I can call foo() successfully if e=c_int(0). However, if e=3, the function does not work. Execution of the python program continues after the call, no errors are raised, but foo() has not done its thing. If I now call bar(x, y, z) after foo(), two things happen. 1. The dll raises an error reporting that argument x is invalid 2. Python reports that too many bytes (4) have been passed to bar() I've checked the types of all the variables a million times, and they are correct according to the docs. The vendor sent me a c program that they claim works. It looks like a translation of mine. I can't run theirs, because I can't figure out how to compile it (I'm don't do c; I do have MinGW; the code was designed for MSVC; I'm lost). I'm suspecting that foo() screws up a stack somewhere. That might explain why bar() chokes on the *first* parameter, while it thinks that the number of arguments is wrong when it gets to the *last*. How can I debug this? Can I view the appropriate stack? What/where would I find it? Any other ideas or advice? etc? thanks, -gary -- http://mail.python.org/mailman/listinfo/python-list
